Take revenge on, as in Watch out for Peter; he’s sure to get back at you. Similarly, get one’s own back means simply “get revenge,” as in She finally saw a chance to get her own back. The first expression dates from the late 1800s, the second from the early 1900s.

verb phrase verb phrase To support or advocate a person, cause, etc; push: If we all get behind the amendment, it’ll pass (1903+) 1. See fall behind 2. Support someone or something; also, help to promote someone or something. For example, We must find as many workers as we can to get behind the union. […]

Improve; recover one’s health. For example, I just started studying Japanese, and I hope to get better soon , or The doctor said I could expect to get better within a couple of days . Also see get well

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